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6
i. The ladder shall be fully extended with the rungs
or treads level with the ground.
ii. The ladder must be erected on a firm, unmovable
surface with a maximum gradient of 15°.
iii. When positioning the ladder take into account
the risk of collision with the ladder, e.g. from
pedestrians, vehicles or doors.
iv. Identify any electrical risks in the work area, such
as overhead lines or other exposed electrical
equipment.
v. The ladder should be stood on both feet; not
supported on the rungs or steps.
vi. Ladders shall not be positioned on slippery
surfaces (such as ice, shiny surfaces or
significantly contaminated solid surfaces)
unless additional effective measured are taken
to prevent the ladder slipping or ensuring
contaminated surfaces are sufficiently clean.
vii. It is recommended that the ladder is positioned
at the correct working angle of 75°. To ensure
correct angle, use the angle indicator marked
on the rail and/or the level-bubble in the
TerrainMaster base. This position is often
referred to the 4:1 rule where the feet of the
ladder are one unit out from the vertical contact
surface for every 4 units measured vertically to
the point of contact of the ladder to the vertical
surface.
4. Positioning and Erecting
the Ladder